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Diffstat (limited to 'SOURCES/0001-kdump-add-support-for-crashkernel-auto.patch')
| -rw-r--r-- | SOURCES/0001-kdump-add-support-for-crashkernel-auto.patch | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/SOURCES/0001-kdump-add-support-for-crashkernel-auto.patch b/SOURCES/0001-kdump-add-support-for-crashkernel-auto.patch deleted file mode 100644 index 8bb55fd..0000000 --- a/SOURCES/0001-kdump-add-support-for-crashkernel-auto.patch +++ /dev/null @@ -1,189 +0,0 @@ -From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 -From: Jeremy Cline <jcline@redhat.com> -Date: Tue, 23 Jul 2019 15:24:30 +0000 -Subject: [PATCH] kdump: add support for crashkernel=auto - -Rebased for v5.3-rc1 because the documentation has moved. - - Message-id: <20180604013831.574215750@redhat.com> - Patchwork-id: 8166 - O-Subject: [kernel team] [PATCH RHEL8.0 V2 2/2] kdump: add support for crashkernel=auto - Bugzilla: 1507353 - RH-Acked-by: Don Zickus <dzickus@redhat.com> - RH-Acked-by: Baoquan He <bhe@redhat.com> - RH-Acked-by: Pingfan Liu <piliu@redhat.com> - - Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1507353 - Build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=16534135 - Tested: ppc64le, x86_64 with several memory sizes. - kdump qe tested 160M on various x86 machines in lab. - - We continue to provide crashkernel=auto like we did in RHEL6 - and RHEL7, this will simplify the kdump deployment for common - use cases that kdump just works with the auto reserved values. - But this is still a best effort estimation, we can not know the - exact memory requirement because it depends on a lot of different - factors. - - The implementation of crashkernel=auto is simplified as a wrapper - to use below kernel cmdline: - x86_64: crashkernel=1G-64G:160M,64G-1T:256M,1T-:512M - s390x: crashkernel=4G-64G:160M,64G-1T:256M,1T-:512M - arm64: crashkernel=2G-:512M - ppc64: crashkernel=2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G - - The difference between this way and the old implementation in - RHEL6/7 is we do not scale the crash reserved memory size according - to system memory size anymore. - - Latest effort to move upstream is below thread: - https://lkml.org/lkml/2018/5/20/262 - But unfortunately it is still unlikely to be accepted, thus we - will still use a RHEL only patch in RHEL8. - - Copied old patch description about the history reason see below: - ''' - Non-upstream explanations: - Besides "crashkenrel=X@Y" format, upstream also has advanced - "crashkernel=range1:size1[,range2:size2,...][@offset]", and - "crashkernel=X,high{low}" formats, but they need more careful - manual configuration, and have different values for different - architectures. - - Most of the distributions use the standard "crashkernel=X@Y" - upstream format, and use crashkernel range format for advanced - scenarios, heavily relying on the user's involvement. - - While "crashkernel=auto" is redhat's special feature, it exists - and has been used as the default boot cmdline since 2008 rhel6. - It does not require users to figure out how many crash memory - size for their systems, also has been proved to be able to work - pretty well for common scenarios. - - "crashkernel=auto" was tested/based on rhel-related products, as - we have stable kernel configurations which means more or less - stable memory consumption. In 2014 we tried to post them again to - upstream but NACKed by people because they think it's not general - and unnecessary, users can specify their own values or do that by - scripts. However our customers insist on having it added to rhel. - - Also see one previous discussion related to this backport to Pegas: - On 10/17/2016 at 10:15 PM, Don Zickus wrote: - > On Fri, Oct 14, 2016 at 10:57:41AM +0800, Dave Young wrote: - >> Don, agree with you we should evaluate them instead of just inherit - >> them blindly. Below is what I think about kdump auto memory: - >> There are two issues for crashkernel=auto in upstream: - >> 1) It will be seen as a policy which should not go to kernel - >> 2) It is hard to get a good number for the crash reserved size, - >> considering various different kernel config options one can setups. - >> In RHEL we are easier because our supported Kconfig is limited. - >> I digged the upstream mail archive, but I'm not sure I got all the - >> information, at least Michael Ellerman was objecting the series for - >> 1). - > Yes, I know. Vivek and I have argued about this for years. :-) - > - > I had hoped all the changes internally to the makedumpfile would allow - > the memory configuration to stabilize at a number like 192M or 128M and - > only in the rare cases extend beyond that. - > - > So I always treated that as a temporary hack until things were better. - > With the hope of every new RHEL release we get smarter and better. :-) - > Ideally it would be great if we could get the number down to 64M for most - > cases and just turn it on in Fedora. Maybe someday.... ;-) - > - > We can have this conversation when the patch gets reposted/refreshed - > for upstream on rhkl? - > - > Cheers, - > Don - - We had proposed to drop the historic crashkernel=auto code and move - to use crashkernel=range:size format and pass them in anaconda. - - The initial reason is crashkernel=range:size works just fine because - we do not need complex algorithm to scale crashkernel reserved size - any more. The old linear scaling is mainly for old makedumpfile - requirements, now it is not necessary. - - But With the new approach, backward compatibility is potentially at risk. - For e.g. let's consider the following cases: - 1) When we upgrade from an older distribution like rhel-alt-7.4(which - uses crashkernel=auto) to rhel-alt-7.5 (which uses the crashkernel=xY - format) - In this case we can use anaconda scripts for checking - 'crashkernel=auto' in kernel spec and update to the new - 'crashkernel=range:size' format. - 2) When we upgrade from rhel-alt-7.5(which uses crashkernel=xY format) - to rhel-alt-7.6(which uses crashkernel=xY format), but the x and/or Y - values are changed in rhel-alt-7.6. - For example from crashkernel=2G-:160M to crashkernel=2G-:192M, then we have - no way to determine if the X and/or Y values were distribution - provided or user specified ones. - Since it is recommended to give precedence to user-specified values, - so we cannot do an upgrade in such a case." - - Thus turn back to resolve it in kernel, and add a simpler version - which just hacks to use the range:size style in code, and make - rhel-only code easily to maintain. - ''' - - Signed-off-by: Dave Young <dyoung@redhat.com> - Signed-off-by: Herton R. Krzesinski <herton@redhat.com> - -Upstream Status: RHEL only -Signed-off-by: Jeremy Cline <jcline@redhat.com> ---- - Documentation/admin-guide/kdump/kdump.rst | 11 +++++++++++ - kernel/crash_core.c | 14 ++++++++++++++ - 2 files changed, 25 insertions(+) - -diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst -index 2da65fef2a1c..d53a524f80f0 100644 ---- a/Documentation/admin-guide/kdump/kdump.rst -+++ b/Documentation/admin-guide/kdump/kdump.rst -@@ -285,6 +285,17 @@ This would mean: - 2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M - 3) if the RAM size is larger than 2G, then reserve 128M - -+Or you can use crashkernel=auto if you have enough memory. The threshold -+is 2G on x86_64, arm64, ppc64 and ppc64le. The threshold is 4G for s390x. -+If your system memory is less than the threshold crashkernel=auto will not -+reserve memory. -+ -+The automatically reserved memory size varies based on architecture. -+The size changes according to system memory size like below: -+ x86_64: 1G-64G:160M,64G-1T:256M,1T-:512M -+ s390x: 4G-64G:160M,64G-1T:256M,1T-:512M -+ arm64: 2G-:512M -+ ppc64: 2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G - - - Boot into System Kernel -diff --git a/kernel/crash_core.c b/kernel/crash_core.c -index e4dfe2a05a31..8c6f59932247 100644 ---- a/kernel/crash_core.c -+++ b/kernel/crash_core.c -@@ -258,6 +258,20 @@ static int __init __parse_crashkernel(char *cmdline, - if (suffix) - return parse_crashkernel_suffix(ck_cmdline, crash_size, - suffix); -+ -+ if (strncmp(ck_cmdline, "auto", 4) == 0) { -+#ifdef CONFIG_X86_64 -+ ck_cmdline = "1G-64G:160M,64G-1T:256M,1T-:512M"; -+#elif defined(CONFIG_S390) -+ ck_cmdline = "4G-64G:160M,64G-1T:256M,1T-:512M"; -+#elif defined(CONFIG_ARM64) -+ ck_cmdline = "2G-:512M"; -+#elif defined(CONFIG_PPC64) -+ ck_cmdline = "2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G"; -+#endif -+ pr_info("Using crashkernel=auto, the size choosed is a best effort estimation.\n"); -+ } -+ - /* - * if the commandline contains a ':', then that's the extended - * syntax -- if not, it must be the classic syntax --- -2.28.0 - |